Results 11 to 20 of about 95 (94)

Study on partial discharge and charge accumulation characteristics of oil‐pressboard insulation under DC superimposed harmonic voltage

High Voltage, Volume 8, Issue 6, Page 1215-1224, December 2023., 2023
Abstract The oil‐pressboard insulation on the valve side of the converter transformer withstands pulsating square wave voltage. The voltage contains lots of DC components and high‐order harmonics, which is likely to cause insulation failures. The partial discharge and space charge experiments of oil‐impregnated pressboard under DC superimposed harmonic
Shuqi Li, Qiang Wang, Dongxin He, Liangkai Wang, Qingquan Li, Wen Si   +5 more
wiley   +1 more source

Study on characteristics gases of metal protrusions partial discharge in 10‐kV air‐insulated switchgear

IET Science, Measurement &Technology, Volume 17, Issue 6, Page 221-229, August 2023., 2023
In order to study the feasibility of the method of gas composition analysis for 10‐kV air‐insulated switchgear, this paper carried out a monitoring experiment of characteristic gases, comprising CO, NO2 and O3, of metal protrusion PD. In addition, three practical factors were considered to carry out the comparative experiments: voltage, air humidity ...
Qipeng Tan, Bin Song, Linong Wang, Shaocheng Wu   +3 more
wiley   +1 more source

Large‐scale plasma grafts voltage stabilizer on hexagonal boron nitride for improving electrical insulation and thermal conductivity of epoxy composite

High Voltage, Volume 8, Issue 3, Page 550-559, June 2023., 2023
Abstract Better electrical insulation and thermal management are both urgently required in integrated power semiconductors. Electrical insulation epoxy encapsulation suffers from poor heat conduction, which has increasingly become a bottleneck of power semiconductors integration.
Penghao Zhang, Chenguo Yao, Liang Yu, Xuetong Zhao, Lisheng Zhao, Linghan Lan, Shoulong Dong   +6 more
wiley   +1 more source

On the Use of Monopole Antennas for Determining the Effect of the Enclosure of a Power Transformer Tank in Partial Discharges Electromagnetic Propagation

Sensors, 2016
A well-defined condition-monitoring for power transformers is key to implementing a correct condition-based maintenance (CBM). In this regard, partial discharges (PD) measurement and its analysis allows to carry out on-line maintenance following the ...
Ricardo Albarracín, Jorge Alfredo Ardila-Rey, Abdullahi Abubakar Mas’ud   +2 more
doaj   +1 more source

AC Breakdown Voltage and Partial Discharge Activity in Synthetic Ester-Based Fullerene and Graphene Nanofluids

IEEE Access, 2022
This paper deals with the study of the AC breakdown voltage (BDV) and partial discharges (PDs) activity of synthetic ester-based nanofluids (NF) with two kinds of carbonic nanoparticles (NPs), namely graphene (Gr) and fullerene (C60); the synthetic ester
Hocine Khelifa, Eric Vagnon, Abderrahmane Beroual   +2 more
doaj   +1 more source

Comparison between the PD Characteristics of g³ and Dry Air for Gas-Insulated Switchgears

Energies, 2022
This paper presents a comparison between the partial discharge (PD) characteristics of g3 and dry air for gas-insulated switchgears. PD signals were measured with a conventional method according to IEC 60270 and an ultra-high frequency (UHF) method.
Goang-Chul Shin, Sung-Wook Kim, Gyung-Suk Kil   +2 more
doaj   +1 more source

Investigation of sensitivity of the ultra-high frequency partial-discharge detection technology for micro-crack in epoxy insulator in GIS

High Voltage, 2020
The ultra-high frequency (UHF) method has been widely used in a gas-insulated system (GIS) for partial-discharge detection, and many achievements have been realised.
Jiangrong Cheng, Yang Xu, Dengwei Ding, Weidong Liu   +3 more
doaj   +1 more source

Bio-inspired Printed Monopole Antenna Applied to Partial Discharge Detection

Sensors, 2019
A new, bio-inspired printed monopole antenna (PMA) model is applied to monitor partial discharge (PD) activity in high voltage insulating systems.
Josiel do Nascimento Cruz, Alexandre Jean René Serres, Adriano Costa de Oliveira, George Victor Rocha Xavier, Camila Caroline Rodrigues de Albuquerque, Edson Guedes da Costa, Raimundo Carlos Silverio Freire   +6 more
doaj   +1 more source

Diagnosis of Insulation Condition of MV Switchgears by Application of Different Partial Discharge Measuring Methods and Sensors

Sensors, 2018
Partial discharges (PD) measurement provides valuable information for the condition assessment of the insulation status of high-voltage (HV) electrical installations.
Fernando Álvarez Gómez, Ricardo Albarracín-Sánchez, Fernando Garnacho Vecino, Ricardo Granizo Arrabé   +3 more
doaj   +1 more source

电极结构和油液条件对局部放电的影响

Dianci bileiqi, 2021
根据IEC 60270标准建立局部放电起始电压（PDIV）测试电路,采用两种方法,即根据IEC61294标准提出IEC方法和根据IEC标准改编的组合PDIV方法,研究了矿物油在针-板电极和针-球电极两种不同电极结构下的局部放电起始电压和局部放电（PD）特性。还研究了不同温度和含水量的Nynas Nytro 4000x矿物油在交流电压下的PDIV和PD特性。试验结果表明,PDIV的大小与电极的电场强度和试验方法有明显关系,与其它电极结构相比,针尖半径为10μm、平面直径为75 mm的针 ...
宋涛, 李丹, 白光亚, 陈少坤
doaj